How to Make It
In a bowl, whisk the vadouvan, salt and sugar. Set the ribs on a rimmed baking sheet and rub the spice mixture all over them; refrigerate, covered, for 8 hours or overnight.
Preheat the oven to 300°. Roast the ribs for 2 1/2 hours, until browned and tender; transfer to a carving board and let rest for 10 minutes. Cut into 2-rib pieces and serve.
Vadouvan, a French curry spice blend flavored with shallots and garlic, is available at specialty food stores and laboiteny.com.